The Miss Universe pageant is changing its rules to allow transgender women to take part in all of its competitions starting in 2013, the organisation and gay rights group Glaad has announced.

The decision follows a media outcry over the disqualification of Canadian contestant Jenna Talackova from the Miss Universe Canada contest because she was not a “naturally born female”.

Talackova 23, who underwent gender reassignment surgery when she was 19, was reinstated to the competition last week by Donald Trump, who owns the Miss Universe organisation. Talackova has a Canadian passport, driver’s licence and other documents that identify her as a woman.

Following consultations with the Gay and Lesbian Alliance Against Defamation (Glaad), Miss Universe “discussed a policy change that includes transgender women in time for the start of this fall’s 2013 pageant season, a time when most of the competitions around the world begin to take place,” the two groups said in a joint statement.

The change brings Miss Universe into line with other groups that have taken a stand against discrimination against transgender women, including the Olympics, the Girl Scouts of America and the TV show America’s Next Top Model, Glaad said.